JP7398837B1 - lens unit - Google Patents

Abstract

The present invention provides a lens barrel and a lens unit with improved versatility. A first accommodating part is formed inside a lens barrel 2, communicating with a first opening, and accommodating a first lens group 3. Further, inside the lens barrel 2, a second accommodating portion is formed which communicates with the second opening and accommodates the second lens group 4. The inner diameter of the second accommodating part from the communication position where the first accommodating part and the second accommodating part communicate to the accommodating position of the second lens group 4 which is distant in the optical axis direction is the same as the diameter of the second lens group 4. The second lens group 4 is housed in the second housing part so as to be movable in the optical axis direction. [Selection diagram] Figure 2A

Description

The present invention relates to a lens unit.

BACKGROUND ART As a lens unit used in an optical device such as a camera, for example, a lens unit in which a plurality of lens groups are housed in a lens barrel along an optical axis direction is known (see, for example, Patent Documents 1 to 3).

JP 2019-144532 Publication Patent No. 6951967 JP2018-054922A

In the lens units of Patent Documents 1 to 3, the inner diameter of the lens barrel gradually becomes narrower from the subject side toward the side opposite to the subject. The outer diameter of each lens group decreases in order from the object side, and the accommodation position of each lens group is fixed at a position corresponding to the inner diameter of the lens barrel. Therefore, it is necessary to prepare a dedicated lens barrel for each focal length, and the lens units of Patent Documents 1 to 3 lack versatility.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a lens unit with improved versatility.

In order to solve the above problems, the lens unit of the present invention includes a first lens group having negative power, a second lens group having positive power, an aperture, and a lens barrel. , the lens barrel has a first opening at its tip for inserting the first lens group, and a first accommodating portion for accommodating the first lens group inserted through the first opening; a second housing having a second opening for inserting the second lens group at an end, housing the second lens group inserted through the second opening, and communicating with the first housing part; and an annular protrusion that protrudes from the inner circumferential surface of the lens barrel toward the central axis of the lens barrel at a communication position where the first housing part and the second housing part communicate with each other. , the second accommodating portion has an inner diameter that is substantially the same as a diameter of the second lens group from the communication position to a accommodating position of the second lens group that is distant in the optical axis direction, and the protruding portion regulates the movement of the first lens group to the second housing section and the movement of the second lens group to the first housing section, and the second lens group is adjacent to each other in the optical axis direction. The length of the second accommodating portion in the optical axis direction is longer than the sum of the lengths of the adjacent plurality of lenses in the optical axis direction, and is movable in the optical axis direction within the second accommodating section, the diaphragm is opposed to the second lens group between the protrusion and the second lens group in the optical axis direction, and The first lens group includes a first lens that is closest to the second housing part in the optical axis direction, and a second lens that is farther from the second housing part than the first lens in the optical axis direction. The first accommodating portion includes a first rear-end accommodating portion that is an inner peripheral portion of the annular protrusion and is closest to the second accommodating portion in the optical axis direction; a first tip-side accommodating portion that is larger in diameter than the accommodating portion and is connected to the first rear-end accommodating portion; a second rear-end accommodating portion that is continuous to the first tip-side accommodating portion; and a second rear-end accommodating portion. a second front end side housing part having a diameter larger than that of the housing part and connected to the second rear side housing part, and the first lens has a curved front end surface of the first lens arranged on the optical axis. a first tip-side central portion that is, a first tip-side peripheral portion that is an end surface continuous to a peripheral edge of the first tip-side central portion, and a cylindrical first large diameter accommodated in the first tip-side housing portion. a first rear end side peripheral portion which is an end surface portion of the rear end surface of the first large diameter portion that is pressed against the protrusion, and a cylindrical portion that protrudes from the rear end surface of the first large diameter portion. and a first small-diameter portion accommodated in the first rear-end housing portion, and the second lens has a rear end curved surface of the second lens disposed on the optical axis. a second rear end side central portion, a second rear end side peripheral portion that is an end surface continuous to a peripheral edge of the second rear end side central portion, and a second rear end side peripheral portion that is a portion accommodated in the second rear end side storage portion. 2 small-diameter portions, the first rear-end peripheral portion abuts the protruding portion , and the second rear-end peripheral portion contacts the first rear-end side peripheral portion in the second rear-end accommodating portion. The second rear end side center part is in contact with the first front end side peripheral part, and is arranged with a gap between the second rear end side center part and the first front end side center part.

The present invention can provide a lens unit with improved versatility. Note that problems, configurations, and effects other than those described above will be made clear by the description of the embodiments below.

FIG. 1A is an external view of a lens unit according to Embodiment 1. FIG. 1B is an external view of the lens barrel according to the first embodiment. FIG. 2A is a longitudinal cross-sectional view of the lens unit according to the first embodiment. FIG. 2B is a longitudinal cross-sectional view of the lens barrel according to the first embodiment. FIG. 3A is an explanatory diagram showing the relationship between the number of spacers and the angle of view according to the first embodiment. (0 spacers) FIG. 3B is an explanatory diagram showing the relationship between the number of spacers and the angle of view according to the first embodiment. (1 spacer) FIG. 3C is an explanatory diagram showing the relationship between the number of spacers and the angle of view according to the first embodiment. (2 spacers) FIG. 3D is an explanatory diagram showing the relationship between the number of spacers and the angle of view according to the first embodiment. (3 spacers) FIG. 3E is an explanatory diagram showing the relationship between the number of spacers and the angle of view according to the first embodiment. (4 spacers) FIG. 4A is an external perspective view of the camera module in a state in which the lens unit 1 according to the first embodiment is moved toward the side opposite to the subject. FIG. 4B is a side view of the camera module with the lens unit 1 according to the first embodiment moved toward the side opposite to the subject. FIG. 4C is an external perspective view of the camera module with the lens unit 1 according to the first embodiment moved toward the subject. FIG. 4D is a side view of the camera module with the lens unit 1 according to the first embodiment moved toward the subject. FIG. 5A is a longitudinal cross-sectional view of a lens barrel according to a modified example. FIG. 5B is a longitudinal cross-sectional view of a lens barrel of a modified example. FIG. 5C is a longitudinal cross-sectional view of a lens barrel according to a modified example.

Embodiments of the present disclosure will be described below with reference to the drawings. The present disclosure contributes to "9. Create a foundation for industry and technological innovation" of the Sustainable Development Goals (SDGs) advocated by the United Nations by realizing a highly versatile lens unit and lens barrel. do.

[Embodiment 1]
[Configuration of lens unit 1 and lens barrel 2]
As shown in FIGS. 1A, B and 2A, B, the lens unit 1 is a fixed focus type lens unit whose focal length does not change. The lens unit 1 includes a lens barrel 2 and a first lens group 3 and a second lens group 4 housed in the lens barrel 2.

The lens barrel 2 is a molded product made of plastic or metal. The lens barrel 2 has a first opening 5 and a second opening 6. The first opening 5 is formed at the end of the lens barrel 2 on the subject side (front end side). The first opening 5 is formed at the end of the lens barrel 2 on the side opposite to the subject (base end side).

The lens barrel 2 has a first accommodating portion 7 and a second accommodating portion 8 inside the lens barrel 2 . The first accommodating portion 7 communicates with the first opening 5 and is formed to be able to accommodate the first lens group 3. The second accommodating portion 8 communicates with the second opening 6 and is formed to be able to accommodate the second lens group 4. The first housing section 7 communicates with the second housing section 8 .

A male thread 9 is formed in a certain range from the base end of the lens barrel 2 on the outer periphery of the lens barrel 2 . The male screw 9 screws into a female screw of a camera module 18 (see FIG. 4), which will be described later. Thereby, the lens unit 1 can be incorporated into the camera module 18. Note that helicoid coupling may be used to couple the lens unit 1 and camera module 18.

The first lens group 3 functions as a focus lens in the lens unit 1. The second lens group 4 functions as a zoom lens in the lens unit 1. The housing position of the first lens group 3 in the first housing portion 7 is fixed. The accommodation position of the second lens group 4 in the optical axis direction in the second accommodation section 8 can be adjusted. Note that the housing position of the lens group can also be referred to as the mounting position or fixed position of the lens group.

The first lens group 3 includes a first lens 31, a second lens 32, and a third lens 33. A light shielding ring 10a is provided between the second lens 32 and the third lens 33. The first lens group 3 has negative power (negative bending power) due to the combination of the first lens 31, the second lens 32, and the third lens 33. In the first lens group 3, the lenses are arranged in this order from the subject side: a third lens 33, a second lens 32, and a first lens 31.

That is, in the first lens group 3, the first lens 31 is arranged closest to the second accommodating portion 8 in the optical axis direction. Further, in the first lens group 3, the second lens 32 is arranged further from the second housing part 8 than the first lens 31 in the optical axis direction, and closer to the second housing part 8 than the third lens 33. There is. Further, in the first lens group 3, the third lens 33 is disposed farthest from the second accommodating portion 8 in the optical axis direction.

The third lens 33 has a diameter that is the same length as the diameter of the first aperture 5, and is the lens with the largest diameter among the third lens 33, the second lens 32, and the first lens 31. Further, among the third lens 33, the second lens 32, and the first lens 31, the first lens 31 is the lens with the smallest diameter. Further, the diameter of the second lens 32 is the length between the diameter of the third lens 33 and the diameter of the second lens 32.

The second lens group 4 includes a fourth lens 41, a fifth lens 42, and a sixth lens 43. A light shielding ring 10b is provided between the fourth lens 41 and the fifth lens 42. The second lens group 4 has positive power (positive bending power) due to the combination of the fourth lens 41, the fifth lens 42, and the sixth lens 43. In the second lens group, the lenses are arranged in this order from the subject side: a fourth lens 41, a fifth lens 42, and a sixth lens 43.

The diameter of the fourth lens 41, the diameter of the fifth lens 42, and the diameter of the sixth lens 43 are all the same diameter. Further, the diameter of the fourth lens 41, the diameter of the fifth lens 42, and the diameter of the sixth lens 43 are smaller than the diameter of the first aperture 5.

Note that at least one of the lenses constituting the first lens group 3 and the lenses constituting the second lens group 4 may include a glass lens. By including a glass lens, it is possible to reduce chromatic aberration and improve temperature characteristics. Furthermore, the lenses included in the lens unit 1 may be made of resin such as plastic.

As shown in FIGS. 2A and 2B, the first accommodating portion 7 is provided with step portions 13 and 14 in order from the subject side. The inner diameter of the lens barrel 2 in the first accommodating part 7 gradually decreases toward the second accommodating part 8 due to the stepped parts 13 and 14. Further, the first housing section 7 includes a third lens housing section 7a that houses the third lens 33, a second lens housing section 7b that houses the second lens 32, and a first lens housing section 7c that houses the first lens 31. has. In the first housing section 7, a third lens housing section 7a, a second lens housing section 7b, and a first lens housing section 7c are arranged in this order from the subject side. Therefore, the first lens 31, the second lens 32, and the third lens 33 can be accommodated in suitable positions. The first lens housing portion 7c is an example of the first portion of this embodiment. The second lens housing portion 7b is an example of the second portion of this embodiment. The third lens housing portion 7a is an example of the third portion of this embodiment.

The inner diameter of the lens barrel 2 is largest in the third lens accommodating part 7a and smallest in the first lens accommodating part 7c. Further, the inner diameter of the lens barrel 2 in the second lens accommodating portion 7b is larger than that of the first lens accommodating portion 7c and smaller than that of the third lens accommodating portion 7a.

The first lens housing portion 7c also has a protrusion 15 that protrudes from the inner peripheral surface of the lens barrel 2 toward the optical axis P (that is, the central axis of the lens barrel 2). The protrusion 15 is an example of a position adjustment mechanism when the spacer 16 is not provided. The optical axis P is an example of the optical axis direction of this embodiment. The protruding portion 15 is an annular plate portion integrally formed on the inner circumferential surface of the lens barrel 2 along the inner circumferential surface of the lens barrel 2 . Note that the protruding portion 15 may be formed on the inner circumferential surface of the lens barrel 2 as one or more protruding pieces that protrude from the inner circumferential surface of the lens barrel 2 . That is, the first accommodating portion 7 has the protruding portion 15 .

In this way, the lens barrel 2 has the protrusion 15 at the boundary between the first accommodating part 7 and the second accommodating part 8. In this embodiment, as an example of a communication position where the first housing part 7 and the second housing part 8 communicate with each other, the end surface of the protruding part 15 on the second housing part 8 side with respect to the direction of the optical axis P of the lens barrel 2 is Define the position as a continuous position. Note that the position of the end surface of the protrusion 15 on the first accommodating part 7 side may be set as the communication position, or the center position of the protrusion 15 in the thickness direction may be set as the communication position. That is, a specific position at the boundary between the first accommodating part 7 and the second accommodating part 8 can be determined as the communication position in this embodiment.

Further, when the first lens 31 is accommodated in the first lens accommodating portion 7c, the base end portion of the first lens 31 is accommodated in the hole 15a at the center of the protruding portion 15. Further, when the first lens 31 is accommodated in the first lens accommodating portion 7c, the end portion of the first lens 31 is pressed against the subject-side regulating surface 15b of the protruding portion 15. Therefore, the first lens 31 can be positioned at a suitable position. Moreover, the first lens 31 can be positioned at a suitable position with a simple configuration. The regulating surface 15b regulates the movement of the first lens 31 toward the second accommodating portion 8 in the optical axis direction. In this way, the protruding portion 15 restricts movement of the first lens 31 toward the second housing portion 8 in the optical axis direction between the first opening 5 and the communication position. The protruding portion 15 is an example of the regulating portion of this embodiment.

Furthermore, when the second lens 32 is accommodated in the second lens accommodating portion 7b, the second lens 32 comes into contact with the first lens 31. Thereby, the first lens 31 restricts the movement of the second lens 32 toward the second accommodating portion 8 side. Further, when the third lens 33 is housed in the third lens housing portion 7a, the third lens 33 comes into contact with the light shielding ring 10a, and the light shielding ring 10a comes into contact with the second lens 32. Thereby, the second lens 32 restricts the movement of the third lens 33 toward the second accommodating portion 8 in the optical axis direction via the light shielding ring 10a.

Further, an aperture 12 is provided between the communication position and the second lens group 4 in the optical axis direction. The diaphragm 12 is an annular plate with an open center, and is disposed facing the second lens group 4 . Note that the aperture 12 may be a film-like aperture.

In the second housing part 8, the inner diameter D1 of the lens barrel 2 from the communication position to the housing position of the second lens group that is farthest in the optical axis direction (for example, the housing position when four spacers 16 described later are provided) is The diameter is the same length as the diameter of the second lens group 4.

For this reason, since the inner diameter of the second accommodating part 8 is unified, the second lens group 4 is movable in the optical axis direction while being accommodated in the second accommodating part 8. Therefore, by changing the position of the second lens group 4 in the second housing part 8 in the optical axis direction, the focal length can be adjusted without replacing the lens barrel 2. In this way, the lens unit 1 of the present embodiment does not require preparing a lens barrel according to the target focal length, so that the versatility of the lens unit 1 and the lens barrel 2 can be increased. Further, the diaphragm 12 is provided between the communication position and the second lens group 4 so as to face the second lens group 4 in the optical axis direction. Therefore, in the lens unit 1, the aperture 12 is arranged at a position where the amount of light incident on the second lens group 4 can be adjusted in the optical axis direction. That is, in the lens unit 1, the amount of light transmitted through the first lens group 3 can be adjusted before the light enters the second lens group 4, regardless of the position of the second lens group 4 in the optical axis direction. .

Furthermore, in this embodiment, the diameter of the second opening 6 (diameter D3: FIG. 2B) is smaller than the diameter of the first opening 5 (diameter D2: FIG. 2B). Further, the inner diameter D1 (see FIG. 2B) of the lens barrel 2 in the second housing portion 8 is the same length as the diameter D3, or is smaller than the diameter D3. Further, the diameter of the opening 15d of the protrusion 15, that is, the inner diameter D4 of the lens barrel 2 at the communication position (see FIG. 2B) is smaller than the diameter D3.

In this embodiment, the third lens 33 has the same length as the diameter of the first aperture 5 (diameter D2: FIG. 2B). The second lens group 4 is a plurality of lenses each having a diameter smaller than the diameter of the first aperture 5 (diameter D2: FIG. 2B). Therefore, the lens barrel 2 can be made compact.

Note that the inner diameter D1 from the communicating position to the accommodation position of the second lens group is not limited to the same length as the diameter of the second lens group 4. For example, as long as the second lens group 4 can be movably accommodated in the second housing portion 8, the inner diameter D1 and the diameter of the second lens group 4 may have substantially the same length. That is, the inner diameter D1 may be the same length as the diameter of the second lens group 4, or may be slightly larger than the diameter of the second lens group 4.

As shown in FIG. 2A, the lens unit 1 has four spacers 16 arranged along the optical axis direction. The spacer 16 is an example of a position adjustment mechanism and a spacer member. Further, the spacers 16 arranged along the optical axis direction are an example of a first annular member and a second annular member. The spacer 16 is located between the communication position and the second lens group 4, and is located closer to the subject than the aperture 12. The spacer 16 is an annular plate. Further, the four spacers 16 have the same thickness. Since the spacers 16 have the same thickness, the manufacturing cost of the spacers 16 can be reduced. As the material of the spacer 16, for example, metal such as stainless steel or aluminum, or resin may be used. Note that from the viewpoint of ease of processing, stainless steel is more suitable than other materials.

The spacer 16 is pressed against the regulating surface 15c (see FIG. 2B) of the protrusion 15. Thereby, movement of the spacer 16 in the optical axis direction is restricted, and further positioning is performed.

3A to 3E are diagrams for explaining the relationship between the number of spacers 16 and the angle of view of the lens unit 1. As shown in FIGS. 3A to 3E, the lens unit 1 adjusts the accommodation position of the second lens group 4 in the second accommodation section 8 by increasing or decreasing the number of spacers 16 accommodated in the second accommodation section 8. Is possible. The lens unit 1 can adjust the position of the second lens group 4 on the optical axis relative to the first lens group 3, that is, the focal length of the lens unit 1, by increasing or decreasing the number of spacers 16 accommodated in the second housing section 8. can be adjusted. Further, the focal length can be adjusted with a simple configuration.

For example, as shown in FIG. 3A, when there are no spacers 16, the angle of view of the lens unit 1 is, for example, 90°. As shown in FIG. 3B, when there is one spacer 16, the angle of view of the lens unit 1 is, for example, 100°. As shown in FIG. 3C, when there are two spacers 16, the angle of view of the lens unit 1 is, for example, 110°. As shown in FIG. 3D, when there are three spacers 16, the angle of view of the lens unit 1 is, for example, 120°. As shown in FIG. 3E, when there are four spacers 16, the angle of view of the lens unit 1 is, for example, 130°.

Specifically, by reducing the number of spacers 16 accommodated in the second accommodating portion 8, the second lens group 4 approaches the first lens group 3, so that the angle of view of the lens unit 1 becomes narrower. In this way, by reducing the number of spacers 16 accommodated in the second accommodating portion 8, the second lens group 4 can be displaced to the telephoto side (telephoto side).

On the other hand, when the number of spacers 16 accommodated in the second accommodating portion 8 is increased, the second lens group 4 moves away from the first lens group 3, so that the angle of view of the lens unit 1 becomes wider. In this way, by increasing the number of spacers 16 accommodated in the second accommodating portion 8, the second lens group 4 can be displaced to the wide-angle side (wide-angle side) and the angle of view can be widened.

In this embodiment, the diameter of the light shielding ring 10a is set to 9.00 mm, the diameter of the opening is set to 5.56 mm, and the thickness is set to 0.15 mm, and the inner diameter of the protrusion 15 is set to 4.50 mm, and the width in the optical axis direction is set to The aperture diameter of the spacer 16 is set to 3.50 mm and the thickness is set to 0.40 mm, the aperture diameter of the aperture 12 is set to 2.66 mm and the thickness is 0.05 mm, and the second It is preferable that the inner diameter of the accommodating portion 8 is set to 6.00 mm.

[How to assemble lens unit 1]
The order of assembling the lens unit 1 of this embodiment will be explained. First, the first lens 31, second lens 32, light shielding ring 10a, and third lens 33 are inserted into the lens barrel 2 through the first opening 5 in this order. The first accommodating portion 7 accommodates the first lens 31, the second lens 32, the light shielding ring 10a, and the third lens 33 inserted into the lens barrel 2. Then, the edge of the third lens 33 is adhered to the inner surface of the lens barrel 2 with the adhesive 17.

Next, the spacer 16, the aperture 12, the fourth lens 41, the light shielding ring 10b, the fifth lens 42, and the sixth lens 43 are inserted into the lens barrel 2 through the second opening 6 in this order. The second accommodating portion 8 accommodates the spacer 16, the diaphragm 12, the fourth lens 41, the light shielding ring 10b, the fifth lens 42, and the sixth lens 43 inserted into the lens barrel 2. Then, by bonding the edge of the sixth lens 43 to the inner surface of the lens barrel 2 using the adhesive 17, the lens unit 1 can be assembled.

Note that the inner diameter of the space L between the second accommodating portion 8 and the second opening 6 of the lens barrel 2 is longer than the inner diameter D1 of the second accommodating portion 8. Further, the edge of the second opening 6 is chamfered by C chamfering. Therefore, the workability when inserting the second lens group 4 into the lens barrel 2 through the second opening 6 can be improved. Further, when the lens barrel 2 is manufactured using a mold, it is possible to easily release the product from the mold.

In this embodiment, an example will be described in which the third lens 33 and the sixth lens 43 are bonded to the lens barrel 2. In addition to adhering the lens to the lens barrel 2, for example, the lens can be fixed to the lens barrel 2 by thermal caulking, or by attaching a fixing ring to the lens barrel 2. The lens may be fixed to the lens barrel 2 in a different manner, such as by.

[The camera module]
FIG. 4A is an external perspective view of the camera module 18 when the lens unit 1 is moved toward the side opposite to the subject, and FIG. 4B is a side view of the camera module 18 when the lens unit 1 is moved toward the side opposite to the subject. It is. FIG. 4C is an external perspective view of the camera module 18 when the lens unit 1 is moved toward the subject, and FIG. 4D is a side view of the camera module 18 when the lens unit 1 is moved toward the subject. .

As shown in FIGS. 4A to 4D, the lens unit 1 can be incorporated into a camera module 18. The camera module 18 has an image processing section in which a photographing element such as a CMOS (Complementary Metal-Oxide-Semiconductor) or a CCD (Charge-Coupled Device) is mounted. Then, the camera module 18 forms an image of the light incident from the lens unit 1 on the photographing element, and acquires an image by converting the light into an electrical signal. The camera module 18 can be used in mobile information terminals, barcode readers, ID (Identification) devices, FA (Factory Automation) devices, robots, security devices, automobiles, and the like. For example, it can be used to identify packages when picking packages by robots, recognize two-dimensional codes in logistics, determine whether products are good or defective on a production line, and determine the degree of human congestion in a specific space.

The camera module 18 has a female thread into which the male thread 9 of the lens unit 1 can be screwed. By screwing the male screw 9 of the lens unit 1 into the female screw of the camera module 18, the lens unit 1 can be assembled into the camera module 18. Then, by manually adjusting the screwing position between the male screw 9 of the lens unit 1 and the female screw of the camera module 18, the position of the lens unit 1 in the optical axis direction can be determined. Specifically, as shown in FIGS. 4A and 4B, the lens unit 1 can be moved toward the side opposite to the subject in the optical axis direction. Further, as shown in FIGS. 4C and 4D, the lens unit 1 can be moved toward the subject in the optical axis direction.

Note that the focus adjustment in the camera module 18 is not limited to manual operation, but may also be performed using an adjustment mechanism using a motor. Furthermore, it is also possible to directly adhere the lens barrel 2 to the camera module 18 without forming a screw on the outer periphery of the lens barrel. In this case, the positional shift of the optical axis can be suppressed compared to the case where the focus is adjusted by rotating the lens unit 1.

[Modified example]
(1) In the present disclosure, not only the lens barrel 2 described in the above embodiment, but also a lens barrel having a different shape from the lens barrel 2 can be applied. Note that the same parts as in Embodiment 1 are denoted by the same reference numerals, and the description thereof will be omitted.

As a lens barrel having a different shape from the lens barrel 2, a lens barrel that does not include a portion corresponding to the protruding portion 15 in the lens barrel 2 can be applied to the present disclosure. For example, as shown in FIG. 5, lens barrels 20, 50, and 60 can be cited as lens barrels that are not provided with the protrusion 15.

As shown in FIG. 5A, the lens barrel 20 includes a first opening 21, a second opening 22, a first accommodating part 23 communicating with the first opening 21, and a second accommodating part 24 communicating with the second opening 22. It is equipped with

The first housing section 23 includes a third lens housing section 23a that stores the third lens 33, a second lens housing section 23b that stores the second lens 32, and a first lens housing section 23c that stores the first lens 31. . In the first accommodating part 23, a third lens accommodating part 23a, a second lens accommodating part 23b, and a first lens accommodating part 23c are arranged in this order from the subject side. The first lens housing portion 23c is an example of the first portion of this embodiment. The second lens housing portion 23b is an example of the second portion of this embodiment. The third lens housing portion 23a is an example of the third portion of this embodiment.

The inner diameter of the lens barrel 20 in the third lens housing part 23a is the largest, the inner diameter of the lens barrel 20 in the first lens housing part 23c is the smallest, and the inner diameter of the lens barrel 20 in the second lens housing part 23b is the largest in the first lens housing part. 23c and smaller than the third lens accommodating portion 23a.

The lens barrel 20 is not provided with a portion corresponding to the protruding portion 15 in the lens barrel 2 in a communicating portion between the first housing portion 23 and the second housing portion 24 . Therefore, in the lens barrel 20 according to the modification, the position of the boundary between the first accommodating part 23 and the second accommodating part 24 may be defined as the communication position. The first lens housing part 23c of the first housing part 23 has a larger inner diameter of the lens barrel 20 than the second housing part 24. Therefore, the movement of the first lens 31 in the direction toward the second opening 22 with respect to the optical axis direction is restricted by the difference in level between the first housing part 23 and the second housing part 24 . Further, the spacer 16 can be arranged to face the first lens 31. In the lens barrel 20, the inner diameter between the second housing part 24 and the second opening 22 is larger than the diameter of the second housing part 24. Further, in the lens barrel 20, the edge of the second opening 22 is not chamfered.

Note that the lens barrel 20 is not provided with a portion corresponding to the protrusion 15 in the lens barrel 2. Further, the inner diameter of the lens barrel 20 is larger in the first lens accommodating part 23c of the first accommodating part 23 than in the second accommodating part 24. Therefore, when assembling the lens barrel, the lenses forming the first lens group 3 and the lenses forming the second lens group 4 can be inserted through the first opening 21.

In addition, if a portion corresponding to the protrusion 15 is not provided, the movement of the first lens 31 in the direction toward the second aperture 22 can be prevented by providing the diaphragm 12 or the spacer 16 on the opposite side of the first lens 31 to the subject. It may be regulated.

As shown in FIG. 5B, the lens barrel 50 includes a first opening 51, a second opening 52, a first accommodating part 53 communicating with the first opening 51, and a second accommodating part 54 communicating with the second opening 52. It is equipped with

The first accommodating part 53 has a third lens accommodating part 53a that accommodates the third lens 33, a second lens accommodating part 53b that accommodates the second lens 32, and a first lens accommodating part 53c that accommodates the first lens 31. . In the first housing section 53, a third lens housing section 53a, a second lens housing section 53b, and a first lens housing section 53c are arranged in this order from the subject side. The first lens housing portion 53c is an example of the first portion of this embodiment. The second lens housing portion 53b is an example of the second portion of this embodiment. The third lens housing portion 53a is an example of the third portion of this embodiment.

The inner diameter of the lens barrel 50 in the third lens accommodating part 53a is the largest, the inner diameter of the lens barrel 50 in the first lens accommodating part 53c is the smallest, and the inner diameter of the lens barrel 50 in the second lens accommodating part 53b is the largest in the first lens accommodating part. 53c and smaller than the third lens accommodating portion 53a. The first lens housing portion 53c is an example of the first portion of this embodiment. The second lens housing portion 53b is an example of the second portion of this embodiment. The third lens housing portion 53a is an example of the third portion of this embodiment.

A portion corresponding to the protruding portion 15 in the lens barrel 2 is not provided in the communication portion between the first accommodating portion 53 and the second accommodating portion 54 . Therefore, in the lens barrel 50 according to the modification, the position of the boundary between the first accommodating part 53 and the second accommodating part 54 may be defined as the communication position. The first lens accommodating part 53c of the first accommodating part 53 has a larger diameter than the second accommodating part 54. Therefore, the movement of the first lens 31 in the direction toward the second opening 52 with respect to the optical axis direction is restricted by the difference in level between the first housing part 53 and the second housing part 54 . Further, the spacer 16 can be arranged to face the first lens 31. In the lens barrel 50, unlike the lens barrel 20, the diameter of the second housing part 54 from the second housing part 54 to the second opening 52 is the same length. Further, unlike the lens barrel 20, the edge of the second opening 52 is processed by C chamfering.

Note that the lens barrel 50 is not provided with a portion corresponding to the protrusion 15 in the lens barrel 2. Further, the inner diameter of the lens barrel 50 is larger in the first lens accommodating part 53c of the first accommodating part 53 than in the second accommodating part 54. Therefore, when assembling the lens barrel, the lenses forming the first lens group 3 and the lenses forming the second lens group 4 can be inserted through the first opening 51.

In addition, if a portion corresponding to the protrusion 15 is not provided, the movement of the first lens 31 in the direction toward the second aperture 22 can be prevented by providing the diaphragm 12 or the spacer 16 on the opposite side of the first lens 31 to the subject. It may be regulated.

As shown in FIG. 5C, the lens barrel 60 includes a first opening 61, a second opening 62, a first accommodating part 63 communicating with the first opening 61, and a second accommodating part 64 communicating with the second opening 62. It is equipped with

The first housing section 63 has a third lens housing section 63a that stores the third lens 33, a second lens housing section 63b that stores the second lens 32, and a first lens housing section 63c that stores the first lens 31. . In the first accommodating part 63, a third lens accommodating part 63a, a second lens accommodating part 63b, and a first lens accommodating part 63c are arranged in this order from the subject side. The first lens housing portion 63c is an example of the first portion of this embodiment. The second lens housing portion 63b is an example of the second portion of this embodiment. The third lens housing portion 63a is an example of the third portion of this embodiment.

The inner diameter of the lens barrel 60 in the third lens accommodating part 63a is the largest, the inner diameter of the lens barrel 60 in the first lens accommodating part 63c is the smallest, and the inner diameter of the lens barrel 60 in the second lens accommodating part 63b is the largest in the first lens accommodating part 63a. 63c and smaller than the third lens accommodating portion 63a.

A portion corresponding to the protruding portion 15 in the lens barrel 2 is not provided in the communication portion between the first accommodating portion 63 and the second accommodating portion 64 . Therefore, in the lens barrel 60 according to the modification, the position of the boundary between the first accommodating part 63 and the second accommodating part 64 may be defined as the communication position. The first lens accommodating part 63c of the first accommodating part 63 has a larger diameter than the second accommodating part 64. Therefore, the movement of the first lens 31 in the direction toward the second opening 62 with respect to the optical axis direction is restricted by the difference in level between the first housing part 63 and the second housing part 64. Further, the spacer 16 can be arranged to face the first lens 31. In the lens barrel 60, unlike the lens barrel 20, the diameter of the second housing part 64 from the second housing part 64 to the second opening 62 is the same length. Further, in the lens barrel 60, the edge of the second opening 62 is not chamfered.

Note that the lens barrel 60 is not provided with a portion corresponding to the protrusion 15 in the lens barrel 2. Further, the inner diameter of the lens barrel 60 is larger in the first lens accommodating part 63c of the first accommodating part 63 than in the second accommodating part 64. Therefore, when assembling the lens barrel, the lenses forming the first lens group 3 and the lenses forming the second lens group 4 can be inserted through the first opening 61.

In addition, if a portion corresponding to the protrusion 15 is not provided, the movement of the first lens 31 in the direction toward the second aperture 22 can be prevented by providing the diaphragm 12 or the spacer 16 on the opposite side of the first lens 31 to the subject. It may be regulated.

(2) Although the above embodiment has been described using an example in which a plurality of spacers 16 are provided as a position adjustment mechanism, a mechanism different from the plurality of spacers 16 can be applied as a position adjustment mechanism.

For example, the position of the second lens group 4 may be adjusted by using spacers having different lengths in the optical axis direction depending on the focal length as the position adjustment mechanism.

Alternatively, for example, by separating the lens barrel housing the first lens group 3 and the lens barrel housing the second lens group 4 and displacing the relative positions of each lens barrel in the optical axis direction, The position of the two lens groups 4 may be adjusted.

Further, for example, the position of the second lens group 4 may be adjusted by using a lens barrel in which the housing position of the second lens group 4 is fixed and the housing position of the second lens group 4 is different.

Further, for example, the position of the second lens group 4 may be adjusted by restricting movement of the second lens group 4 by driving a pin into a hole formed in the outer peripheral surface of the lens barrel.

Further, for example, by forming a slit on the outer peripheral surface of the lens barrel and applying adhesive through the slit, the lens barrel and the lens are fixed, and movement of the second lens group 4 is restricted. You may adjust the position of.

(3) In the above embodiment, an example has been described in which the position of the lens group on the side opposite to the subject can be displaced, but a configuration in which the position of the lens group on the side of the subject can be displaced may also be used.

(4) In the above embodiment, an example has been described in which the opening 15d of the protruding portion 15 on the second accommodating portion 8 side is the communication position in the lens barrel 2. In addition to the embodiments described above, the first accommodating part 7 and the second accommodating part 8 are made to communicate with each other without providing the protruding part 15 on the lens barrel 2, and the boundary between the first accommodating part 7 and the second accommodating part 8 is formed. may be used as the communication position.

Although various embodiments have been described above with reference to the drawings, it goes without saying that the present disclosure is not limited to such examples. It is clear that those skilled in the art can come up with various changes, modifications, substitutions, additions, deletions, and equivalent examples within the scope of the claims, and It is understood that it naturally falls within the technical scope of the present disclosure. Further, each component in the various embodiments described above may be combined as desired without departing from the spirit of the invention.

The present disclosure is useful as a lens unit and lens barrel with improved versatility.

1 Lens unit 2 Lens barrel 3 First lens group 4 Second lens group 5 First aperture 6 Second aperture 7 First accommodating part 7a Third lens accommodating part (third part)
7b Second lens housing part (second part)
7b1 Second rear end side accommodating part 7b2 Second front end side accommodating part 7c First lens accommodating part (first part)
7c1 First rear end side accommodating part 7c2 First tip side accommodating part 8 Second accommodating part 15 Projection part (regulating part)
15b Regulatory aspects
15c Regulation surface (rear end side)
16 Spacer (space member)
31 First lens 31a First large diameter portion 31b First small diameter portion 31c First rear end side peripheral portion 31d First tip side peripheral portion 31e First tip side central portion 32 Second lens 32a Second large diameter portion 32b Second Small diameter part 32c Second rear end side peripheral part 32d Second rear end side central part 33 Third lens 41 Fourth lens 42 Fifth lens 43 Sixth lens 70 Gap

Claims (11)

a first lens group having negative power;
a second lens group having positive power;
Aperture and
In a lens unit equipped with a lens barrel,
The lens barrel is
a first accommodating portion having a first opening for inserting the first lens group at a distal end and accommodating the first lens group inserted through the first opening;
A second lens having a second opening for inserting the second lens group at its rear end, accommodating the second lens group inserted through the second opening, and communicating with the first housing part. A storage section,
an annular protrusion protruding from the inner circumferential surface of the lens barrel toward the central axis of the lens barrel at a communication position where the first housing part and the second housing part communicate;
The second accommodating portion has an inner diameter that is substantially the same as a diameter of the second lens group from the communication position to the accommodating position of the second lens group that is distant in the optical axis direction,
The protrusion restricts movement of the first lens group to the second housing part and movement of the second lens group to the first housing part,
The second lens group includes a plurality of lenses adjacent in the optical axis direction,
The length of the second housing part in the optical axis direction is longer than the total length of the plurality of adjacent lenses in the optical axis direction,
The plurality of adjacent lenses are movable in the optical axis direction within the second housing part,
The diaphragm faces the second lens group between the protrusion and the second lens group in the optical axis direction,
The first lens group includes a first lens that is closest to the second housing part in the optical axis direction, and a second lens that is farther from the second housing part than the first lens in the optical axis direction. have,
The first accommodating part includes a first rear end accommodating part that is an inner peripheral part of the annular protrusion and is closest to the second accommodating part in the optical axis direction, and a first rear end accommodating part. a first tip-side accommodating portion that has a diameter larger than that and is connected to the first rear-end accommodating portion; a second rear-end accommodating portion that is continuous to the first tip-side accommodating portion; and a second rear-end accommodating portion. a second tip-side accommodating portion having a diameter larger than that of the second accommodating portion and connected to the second rear-end accommodating portion;
The first lens is
A first tip-side center portion that is a curved tip surface of the first lens disposed on the optical axis, a first tip-side peripheral portion that is an end surface continuous to a peripheral edge of the first tip-side center portion, and the first tip end. a cylindrical first large-diameter portion accommodated in the side storage portion; a first rear-end peripheral portion that is an end surface portion pressed against the protrusion on the rear end surface of the first large-diameter portion; A single lens having a first small diameter portion that is a cylindrical portion that protrudes from the rear end surface of the large diameter portion and is accommodated in the first rear end side accommodating portion;
The second lens is
a second rear end side central portion which is a rear end curved surface of the second lens arranged on the optical axis; and a second rear end side peripheral portion which is an end surface continuous to a peripheral edge of the second rear end side central portion. , a second small diameter portion that is a portion accommodated in the second rear end side accommodation portion,
The first rear end side peripheral portion abuts the protrusion ,
The second rear end side peripheral part abuts the first front end side peripheral part in the second rear end side accommodating part,
The second rear end side center part is arranged with a gap between the second rear end side center part and the first front end side center part.
lens unit. The lens unit is
When the position of the second lens group relative to the first lens group in the optical axis direction is the first position, the angle of view is the first angle of view, and the second lens group is located farther from the first lens group than the first position. a second angle of view that is larger than the first angle of view when the position is
The lens unit according to claim 1. The lens unit is
When the position of the second lens group with respect to the first lens group in the optical axis direction is the first position, the second lens group has a first focal length, and the second lens group is farther from the first lens group than the first position. a second focal length shorter than the first focal length when the second focal length is at the position;
The lens unit according to claim 1. comprising a spacer member that adjusts the position of the second lens group with respect to the first lens group in the optical axis direction;
The lens unit according to claim 1. In the second housing part, the protruding part, the spacer member, the diaphragm, and the second lens group are arranged in this order from the tip to the rear end,
The lens unit according to claim 4. The spacer member is pressed against a regulating surface that is a rear end side surface of the protrusion.
The lens unit according to claim 5. The spacer member includes a first annular member and a second annular member arranged in parallel with the first annular member along the optical axis direction,
The first annular member has the same thickness as the second annular member,
The lens unit according to claim 4. The first lens group is a plurality of lenses including lenses having substantially the same diameter as the diameter of the first aperture,
The plurality of adjacent lenses constituting the second lens group have a diameter smaller than the diameter of the first aperture.
The lens unit according to claim 1. The first lens group includes a third lens that is further away from the second housing part than the second lens in the optical axis direction and has a larger diameter than the second lens,
The first accommodating part has a third part that accommodates the third lens,
the second lens restricts movement of the third lens toward the second accommodating portion in the optical axis direction;
The lens unit according to claim 8. At least one of the first lens group or the second lens group includes a glass lens.
The lens unit according to claim 8 or 9. a first lens group having negative power;
a second lens group having positive power;
Aperture and
In a lens unit equipped with a lens barrel,
The lens barrel is
a first accommodating portion having a first opening for inserting the first lens group at a distal end and accommodating the first lens group inserted through the first opening;
A second lens having a second opening for inserting the second lens group at its rear end, accommodating the second lens group inserted through the second opening, and communicating with the first housing part. A storage section,
an annular protrusion protruding from the inner circumferential surface of the lens barrel toward the central axis of the lens barrel at a communication position where the first housing part and the second housing part communicate;
The second accommodating portion has an inner diameter that is substantially the same as a diameter of the second lens group from the communication position to the accommodating position of the second lens group that is distant in the optical axis direction,
The protrusion restricts movement of the first lens group to the second housing part and movement of the second lens group to the first housing part,
The second lens group includes a plurality of lenses adjacent in the optical axis direction,
The length of the second housing part in the optical axis direction is longer than the total length of the plurality of adjacent lenses in the optical axis direction,
The plurality of adjacent lenses are movable in the optical axis direction within the second housing part,
The diaphragm faces the second lens group between the protrusion and the second lens group in the optical axis direction,
The first lens group includes a first lens disposed closest to the second accommodating part in the optical axis direction, and a first lens disposed further from the second accommodating part in the optical axis direction than the first lens. a second lens,
The first accommodating part includes a first rear end accommodating part that is an inner peripheral part of the annular protrusion and is closest to the second accommodating part in the optical axis direction, and a first rear end accommodating part. a first tip-side accommodating portion that has a diameter larger than that and is connected to the first rear-end accommodating portion; a second rear-end accommodating portion that is continuous to the first tip-side accommodating portion; and a second rear-end accommodating portion. a second tip-side accommodating portion having a diameter larger than that of the second accommodating portion and connected to the second rear-end accommodating portion;
The first lens is
A first tip-side center portion that is a curved tip surface of the first lens disposed on the optical axis, a first tip-side peripheral portion that is an end surface continuous to a peripheral edge of the first tip-side center portion, and the first tip end. A unit having a cylindrical first large-diameter portion accommodated in a side storage portion, and a first rear end-side peripheral portion that is an end surface portion pressed against the protrusion on a rear end surface of the first large-diameter portion. It is a lens,
The second lens is
a cylindrical second large-diameter portion accommodated in the second tip-side accommodating portion; and a cylindrical portion protruding from a rear end surface of the second large-diameter portion; a second small diameter portion to be accommodated, a second rear end side central portion which is a rear end curved surface of the second lens disposed on the optical axis, and an end surface continuous to a peripheral edge of the second rear end side central portion. A single lens having a second rear end side peripheral portion,
The first rear end side peripheral portion abuts the protrusion ,
The second rear end side peripheral part abuts the first front end side peripheral part in the second rear end side accommodating part,
The second rear end side center part is arranged with a gap between the second rear end side center part and the first front end side center part.
lens unit.

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